Apple has rolled out its fifth update for the Safari Technology Preview, making a long list of improvements to things like JavaScript, CSS, and the Web Inspector. The release also bolsters security and stability.

Developers and public beta testers alike can download the latest El Capitan starting today now that Apple has seeded the third beta of OS X 10.11.5, plus the public version of iOS 9.3.2 beta 3.

The new updates come a week after Apple released the second beta builds of the new operating systems. Testers can grab the new software through the Mac App Store if you’re signed up for Apple’s Public Beta Program, but Apple has a couple extra goodies for developers as well.

You can get a taste of the future of Safari on the Mac today, thanks to the release of the new Safari Technology Preview from Apple that gives regular users and developers an easy way to test new features and improvements that are coming soon to the web browser.

The new stand-alone app for OS X can be downloaded and used for free by anyone, and includes a cutting-edge version of the WebKit browser engine that is still in development. It’s a great way for web developers to get ahead on new features by testing them before they’re public.

Safari Technology Preview can be used side-by-side with the regular version of Safari to test for behavioral issues. It also includes new improvements for Web Inspector.